Growth Changes in NE Shelf Species

Changes in Size and Weight at Age Across Cohorts

Author

Affiliation

Gulf of Maine Research Institute

Published

March 29, 2023

Decadal Variability in Growth Model Exploration

The following tables show the available data by species for assessing size-at-age changes among species sample by the federal trawl survey. Each row indicates the number of individuals sampled and aged by the survey program. All species aged will have lengths, but some may not have weights, particularly in earlier years.

american plaice

	1	2	3	4	5	6	7	8	9	10	>10
American Plaice - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - american plaice
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980	5	41	118	139	119	75	61	21	22	12	14
1981	14	107	116	154	125	88	54	31	19	18	24
1982	10	58	86	77	56	44	35	25	15	7	8
1983	23	55	102	188	122	85	54	24	10	9	23
1984	1	45	69	84	102	45	16	11	1	2	7
1985	13	38	138	93	83	65	30	31	10	5	9
1986	19	46	62	126	69	41	27	19	4	2	4
1987	37	77	80	65	66	32	20	7	6	2	4
1988	62	107	137	80	49	26	10	2	7	2	3
1989	15	124	160	111	40	28	11	4	10	2	2
1990	21	51	239	157	76	34	12	8	6	4	2
1991	20	81	117	201	125	39	8	4	2	1	3
1992	35	90	179	169	166	63	17	8	5	4	2
1993	89	163	210	178	115	101	26	12	6	5	3
1994	72	208	198	178	142	53	29	14	2	2	4
1995	22	212	317	245	128	50	21	5	4	3	5
1996	40	76	185	301	134	62	18	7	4		2
1997	38	117	171	224	190	51	12	2	1	1	2
1998	85	62	181	205	223	163	33	11	2	2	3
1999	122	161	173	236	189	117	55	17	2	1
2000	27	171	205	181	161	95	69	27	10	5	2
2001	21	60	239	241	152	79	50	28	17	8	2
2002	58	63	116	297	202	71	55	39	27	13	3
2003	25	156	85	152	194	104	45	18	15	10	12
2004	58	74	122	138	104	98	38	15	21		4
2005	70	154	112	133	102	65	28	21	4	6	1
2006	142	236	248	253	150	66	59	25	6	5	4
2007	60	271	276	220	139	57	24	9	2	3	1
2008	69	93	266	281	172	101	46	12	11	5	5
2009	66	157	172	345	340	178	79	32	11	7	5
Warm Regime - american plaice
2010	45	168	191	189	283	205	88	34	22	10	5
2011	131	102	153	181	159	168	147	84	36	15	11
2012	148	221	204	195	186	125	127	95	48	12	17
2013	127	184	213	124	72	136	50	57	45	23	11
2014	258	259	289	233	120	73	125	48	50	37	33
2015	64	632	404	294	197	82	54	81	23	22	39
2016	147	130	707	332	166	114	32	44	57	30	38
2017	20	139	85	442	176	83	50	18	13	28	27
2018	100	40	153	66	246	93	50	34	18	11	40
2019	114	235	76	226	100	227	66	43	17	7	40

atlantic cod

	1	2	3	4	5	6	7	8	9	10	>10
Atlantic Cod - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - atlantic cod
1970	64	54	50	86	37	52	45	8	8	8	14
1971	37	85	44	50	65	25	30	31	16	4	7
1972	249	129	168	32	20	30	11	26	18	5	8
1973	53	535	125	153	40	20	24	14	20	15	26
1974	58	119	293	36	64	18	4	12	4	6	10
1975	48	130	67	196	18	37	3	5	8	2	5
1976	95	99	100	32	103	13	25	3	1	1	5
1977	8	217	79	130	24	89	2	9	1	3	7
1978	129	29	369	115	127	28	61	6	18	2	5
1979	140	281	48	319	89	112	20	37	3	8	5
1980	76	105	142	23	60	28	23	6	10	1	8
1981	162	105	152	128	16	47	11	11	3	8	1
1982	65	216	72	68	68	2	19	5	4	1	1
1983	51	135	162	47	35	24	4	5	2	5	8
1984	79	72	91	94	22	15	11		7		3
1985	34	174	82	81	89	18	10	10	1	4	2
1986	116	63	149	40	36	39	6	4	8		2
1987	52	233	66	73	13	7	13	1	2		3
1988	104	131	236	42	39	9	5	6	1
1989	84	173	132	159	26	21	1	2	2	1	1
1990	27	122	255	93	72	8	11	1	1	1
1991	108	68	87	154	44	19	7	3
1992	65	211	70	38	93	25	15	2	2
1993	57	107	165	30	13	38	9	4	3	2	1
1994	52	154	130	62	20	7	15	5	3	1
1995	26	99	201	70	45	8	5	2	1
1996	34	55	105	181	39	21	2	1
1997	70	87	57	60	93	17	16	2
1998	42	154	110	87	43	53	9	3
1999	82	104	171	94	50	18	22	2	1		1
2000	82	163	98	134	41	15	3	5
2001	13	73	169	68	68	20	13	4	2	1
2002	72	56	121	261	60	51	10	5	1	1
2003	31	114	50	126	145	38	32	6	9	1	2
2004	137	30	132	64	61	53	12	11	4	2
2005	25	164	37	139	25	30	27	5	2
2006	111	72	205	43	93	18	27	16	1	1	2
2007	44	130	76	232	30	47	5	3
2008	72	150	140	57	112	8	11		1	2
2009	169	211	165	112	60	61	4	7	2	1
Warm Regime - atlantic cod
2010	110	167	145	124	52	23	22	2	3	1	3
2011	122	167	104	115	58	31	6	9
2012	78	220	190	118	58	21	12	1	1
2013	35	210	223	99	31	11	4
2014	100	67	122	154	28	10	4		2
2015	82	308	93	160	88	12	3
2016	36	116	426	87	93	21	3	1
2017	40	53	111	299	75	60	12
2018	87	53	52	61	75	3	4		1
2019	61	95	47	46	43	28	1	3

atlantic herring

	1	2	3	4	5	6	7	8	9	10	>10
Atlantic Herring - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - atlantic herring
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987	2	33	64	89	11	9
1988	9	38	19	24	56	15	1
1989	7	71	43	34	33	24	7	3
1990		79	66	62	28	4	1
1991		44	48	78	21	6	1	1
1992		67	102	71	53	13	3	1
1993	3	36	133	129	146	44	8	1
1994	5	126	114	212	225	168	60	13	4	1
1995	53	111	189	88	217	137	68	15	1
1996	9	311	199	131	65	131	93	45	5	1	1
1997	3	37	227	92	78	81	67	20	7
1998	1	189	239	311	104	93	92	42	19	5	1
1999	9	49	240	114	260	109	77	40	11	1
2000	1	186	128	120	127	144	67	27	5	1
2001	4	56	343	53	66	106	129	33	6	4
2002	103	45	64	205	63	91	88	53	14	2
2003	31	276	160	68	168	77	76	53	15	2	1
2004	2	333	328	76	39	81	62	37	26	9	4
2005	6	126	239	139	68	43	60	48	35	15	6
2006	15	48	145	153	129	54	37	32	17	9	2
2007	4	288	161	135	134	116	32	30	8	1
2008	6	24	217	187	84	85	94	42	24	6	1
2009	78	301	266	362	128	88	113	70	26	7	3
Warm Regime - atlantic herring
2010	40	662	516	178	280	50	64	49	21
2011	24	101	626	349	126	133	31	34	10
2012	115	121	127	462	143	76	49	10	4
2013	13	384	203	155	268	63	37	6	1
2014	13	99	484	95	104	239	48	13	3
2015	10	154	150	316	78	98	138	30	6
2016	4	62	208	137	316	69	75	61	10
2017	15	66	148	165	139	246	61	49	13	2
2018	2	28	36	55	66	73	102	23	10	3
2019	33	31	164	56	97	107	92	54	15	6

atlantic mackerel

	1	2	3	4	5	6	7	8	9	10	>10
Atlantic Mackerel - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - atlantic mackerel
1970
1971
1972
1973	45	45	15	14	3	13	9	3		1	7
1974	30	10	12		1
1975	26	13	5	3	2	2	1
1976	13	25	7	4	1	1
1977	3	13	26	15	6	2	1	3	2	2	3
1978	8	18	11	11		2	2	1	1		1
1979	17	4	3	3	13	3	1	2	2	3	4
1980	6	27	2	1	5	10	2		2	1	2
1981	6	6	15	2		2	8	3	2		2
1982	13	8		5		1	1	1	2		4
1983	27	18
1984	1	12
1985	13		9	1			1				1
1986	9	20	3	23	4
1987	26	51	21	7	54	4	2		3
1988	12	20	19	10	2	51	10		1		5
1989	12	27	2	1			4	1
1990	24	36	19		1			2
1991	9	3	10	1		2			5
1992	57	40	11	14	10	1	1			7
1993	27	33	11	6	18	2	1	2	3	1	8
1994	125	42	47	23	8	27	10	4	1	5	14
1995	91	111	22	44	26	5	27	5			3
1996	131	98	47	4	32	26	8	11	10		1
1997	114	60	23	17	1	1	5	1	5	2	1
1998	183	123	36	15	4	2	9	3	1	2
1999	96	112	73	25	16	3		8	4
2000	178	70	36	28	7	4	2		2	1
2001	140	161	20	4	11	3			1
2002	65	77	101	6	4	2	1
2003	135	117	46	59	10	2	2
2004	149	83	8	3	8	1
2005	39	94	40	11	2	20	3
2006	82	91	83	18	3	2	4
2007	87	175	48	43	9		1	3
2008	99	45	37	5	4				2
2009	229	179	33	24	1	2
Warm Regime - atlantic mackerel
2010	160	237	74	9	13		3
2011	309	76	93	20	3	1
2012	221	128	19	27	4	1
2013	148	184	126	5	8	1
2014	100	71	73	14
2015	273	208	46	36	8
2016	188	198	65	5	3	2
2017	26	219	127	28	3	3
2018	88	5	141	33	3		1
2019	119	218	8	117	10	5

black sea bass

	1	2	3	4	5	6	7	8	9	10	>10
Black Sea Bass - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - black sea bass
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983	1	4
1984	8	8	8	7	2	2
1985	19	12	12	14	3	1
1986	16	55	24	1				1
1987	9	60	34	9	4	3
1988	7	31	38	14	1	3		1
1989	7	41	12	3		1		1
1990	17	32	24	4	2		1
1991	27	24	3	3	1
1992	15	69	52	9	2					1
1993	5	26	32	5
1994	11	9	28	14	6	2			1
1995	30	25	14	3					1
1996	12	30	24	9	4	3
1997
1998	4	35	15	10		1		1
1999	28	18	28	13	2	1
2000		10	9	12	2
2001	19	67	27	7	1
2002	46	36	56	40	4	1	2		1
2003	7	57	43	37	19	2	1
2004	20	46	40	22	29	7		1
2005	16	22	10	33	5	16
2006	20	22	12	14	12	5	1
2007	28	34	11	10	1	3	2
2008	19	14	13	2	1		1
2009	113	104	45	20	4	4	1
Warm Regime - black sea bass
2010	68	95	86	47	28	9	2	7	1
2011	62	45	44	39	15	7	1			1
2012	157	60	34	22	16	6	2		1		1
2013	44	200	59	48	25	10	1	3
2014	31	59	107	18	13	8	7	4	1
2015	41	62	42	66	14	10	5	1	1
2016	58	64	48	34	102	6	5	5	1
2017	29	123	51	16	15	42	2	4		2
2018	24	75	83	31	15	8	25		2
2019	73	34	73	68	10		4	7

butterfish

	1	2	3	4	5	6
Butterfish - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - butterfish
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982	129	64	26	7	2
1983	137	76	18	2	3
1984	92	76	29	1
1985	163	44	20	6
1986	105	93	15	2
1987	125	66	16	2
1988	67	60	7	1
1989	61	41	18	1
1990	95	50	12	2
1991	188	57	17	1
1992	243	109	15	1
1993	249	79	27
1994	229	132	29	4
1995	383	190	20
1996	153	120	35	2
1997	374	71	15
1998	206	90	19
1999	161	78	12
2000	299	75	18	3
2001	243	167	18
2002	207	117	56	5
2003	176	45	28	8	1
2004	196	34	8	4
2005	95	75	29	11	2
2006	276	66	24	9
2007	357	85	31	4
2008	238	77	18	3
2009	401	126	43	9	1
Warm Regime - butterfish
2010	534	146	52	3	2
2011	366	149	46	20	3
2012	601	184	70	24	1
2013	325	160	75	16	1	3
2014	418	107	52	8	3
2015	390	220	47	9		1
2016	449	186	78	1
2017	226	138	68	13	1
2018	362	173	92	8	2
2019	350	146	71	9	1

haddock

	1	2	3	4	5	6	7	8	9	10	>10
Haddock - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - haddock
1970	40	19	3	16	14	27	146	52	13	8	7
1971		74	22	1	14	3	12	126	25	3	6
1972	150	2	51	15	3	8	8	2	74	14	13
1973	132	160	1	38	7		10	3	7	95	18
1974	78	143	77		9	1	1	4	2	1	32
1975	36	148	142	95		10	2	3		1	15
1976	184	30	79	62	62		8	1	2		16
1977	63	280	34	87	51	44	2	1			11
1978	11	66	389	20	39	56	8		1	1	5
1979	257	29	88	326	36	30	23	5	3		1
1980	57	126	11	40	89	20	10	10	2	1	2
1981	66	97	224	55	65	81	7	9	3
1982	6	74	71	134	20	13	42	1	1	4
1983	47	26	90	41	99	10	7	47	1	2	2
1984	60	70	37	61	27	48	3	8	14		3
1985	7	141	115	18	41	29	46	6	1	8
1986	62	9	137	46	20	25	11	16	5	2
1987	1	70	12	70	14	12	5	5	3
1988	104	9	83	11	43	13	6	5
1989	12	147	26	53	12	24	5	3		1
1990	36	7	155	12	33	5	8	1
1991	35	40	26	71	8	9	3	4	1
1992	100	32	21	13	50	4	7	3	4
1993	112	127	41	14	16	45	5	1	2
1994	89	124	76	20	9	8	20	4	3		2
1995	112	167	156	63	15	12	7	13	4	1	3
1996	66	93	205	96	53	8	7	3	12	3	2
1997	211	68	82	151	69	31	4	10	5	1	2
1998	145	136	65	101	69	28	7	2		1	3
1999	298	136	159	59	75	57	27	21	7	2	1
2000	140	276	191	117	62	48	38	15	6	2	1
2001	251	149	339	86	70	35	24	16	7	2	1
2002	89	338	180	330	72	37	31	22	14	8	2
2003	28	74	234	99	345	41	33	9	11	7	8
2004	458	42	78	367	70	216	26	31	7	8	14
2005	49	663	22	61	301	69	150	17	9	1	3
2006	181	47	678	17	46	155	48	110	12	5	2
2007	124	213	33	670	9	19	67	15	42	4	2
2008	91	106	129	9	449	5	14	30	10	26	2
2009	117	103	95	119	20	595	9	15	29	6	26
Warm Regime - haddock
2010	191	102	108	69	116	25	723		6	28	26
2011	718	121	62	36	51	72	21	422	3	4	22
2012	286	680	76	28	28	34	47	11	181	3	10
2013	415	191	697	39	16	23	27	23	4	105	2
2014	1340	374	216	762	23	15	11	15	12	2	26
2015	170	1450	311	186	808	27	5	3	10	6	13
2016	433	138	1703	198	127	578	12	2	5	7	4
2017	350	260	85	1451	100	57	290	12			3
2018	146	275	105	47	1065	49	25	103	4	1	1
2019	169	106	213	86	60	1212	36	14	39

pollock

	1	2	3	4	5	6	7	8	9	10	>10
Pollock - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - pollock
1970	22	12	15	22	12	10	7	8	5	4	21
1971	18	34	29	12	11	17	3	13	5	7	30
1972	69	58	25	7	7	9	11	16	4	5	32
1973	3	104	19	22	19	14	7	15	1	22	18
1974		12	58	23	9	17	12	1		2	16
1975	12	19	20	26	9	10	9	5	3	5	30
1976	5	17	17	35	45	20	18	17	8	3	39
1977	15	29	19	16	26	37	17	15	4	3	15
1978	3	31	18	12	19	15	32	19	18	7	28
1979	22	7	36	28	26	25	16	30	18	11	28
1980	22	9	10	18	21	18	14	9	8	5	14
1981	1	31	16	7	9	11	4	5	3	8	18
1982	6	28	32	19	2	14	7	5	5	1	6
1983	29	4	7	8	4	3	5	10	3	3	21
1984	15	26	10	7	12	6	2	3	4	1	7
1985	29	5	32	22	33	33	10		4	7	14
1986	15	38	19	19	12	11	15	4	3	2	16
1987	11	28	10	3	3	3	10	9	5		7
1988	33	9	24	15	5	6	3	4	3	3	15
1989	28	22	18	22	12	13	8	8	2	5	8
1990	5	10	42	13	7	7	5	5	6	4	8
1991	21	22	30	50	32	19	11	2	2		6
1992	34	48	29	26	20	11	7	5		2	8
1993	35	45	33	17	10	19	5	3	1	1	2
1994	3	20	35	26	19	14	7	5	1	1	2
1995	8	26	52	40	31	18	10	6	2	1
1996	25	22	8	23	24	10	6	2
1997	40	50	36	63	69	16	13	1	3	1
1998	66	40	52	22	12	22	18	7	4
1999	43	90	44	44	21	21	10	2
2000	76	65	31	12	13	9	4	2	1
2001	28	59	51	43	40	25	16	6		2	1
2002	29	27	45	53	38	28	12	2
2003	14	69	19	46	22	13	4	2			2
2004	18	41	55	23	39	17	10	1		2
2005	3	52	15	31	36	78	25	11	4	2
2006	24	16	15	7	13	35	59	5	1	1
2007	29	17	23	13	31	48	42	5	2
2008	48	21	10	10	16	19	51	22	27	11	8
2009	22	36	12	3	10	5	4	21	8	2	3
Warm Regime - pollock
2010	21	16	25	19	16	11	13	18	9	3	6
2011	57	28	25	34	32	33	13	13	10	5	6
2012	63	44	18	8	22	13	15	6	7	6	9
2013	11	56	40	12	4	10	6	10	4	3	5
2014	55	50	90	28	18	5	10	3	1		2
2015	12	95	46	49	28	23	8	19	6	3	3
2016	1	29	140	83	65	23	11	6	4	3
2017	3	19	30	45	25	36	9	6	2	1
2018	2	16	13	17	25	10	18	9	2
2019	2	5	13	9	17	43	15	17	2

scup

	1	2	3	4	5	6	7	8	9	10	>10
Scup - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - scup
1970
1971		1
1972
1973				1	1			1
1974
1975
1976	2	1
1977	34	38	7	13	3	1	2				1
1978	31	18	35	12	11	7		2			1
1979	50	34	5	17	10	5	5	2	1
1980	38	35	15	6	8	5	1	2	1
1981	42	36	20	4	3	2		4
1982	36	23	25	10	4	7	1	1
1983	35	8	6				1
1984	24	8	2	2	2
1985	38	22	9	2	1
1986	39	36	4	1
1987	32	28	33	10	2	3	1	1			1
1988	15	10	2	2		1	2
1989	33	25	4
1990	10	24	14	6	1	6	1
1991	46	9	18	6
1992	88	46	7	4	4	1
1993	14	31	5	2	1
1994	11	6	4	2
1995	37	19	6	4
1996	23	14	5	2
1997	5	22	9
1998	48	4	3
1999	37	19	1	1
2000	44	18	12	1	1
2001	72	28	6	2	1
2002	73	35	41	20	3
2003	49	28	8	9	3
2004	39	25	18	7	9	1
2005	55	23	5	5	3	1
2006	72	14	11	7	5	8	1
2007	48	19	17	2	5	4	2
2008	36	19	20	6	5	6	3	4
2009	77	21	9	2	1
Warm Regime - scup
2010	127	75	44	38	23	11	1	6	1	1
2011	115	31	19	18	12	3		1	1
2012	137	37	10	30	13	7	4	1
2013	74	51	18	8	14	5	2	1
2014	43	27	50	30	14	5	7	8	1	1	3
2015	41	36	16	11	8	6	6	3	2	1	1
2016	120	116	29	17	15	11	12	9	4	5	8
2017	52	60	29	10	6	5		2	1	1
2018	47	37	82	46	20	16	8	8	4	5	1
2019	83	13	28	48	31	6	9	5	3	2	4

silver hake

	1	2	3	4	5	6	7	8	9	10	>10
Silver Hake - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - silver hake
1970
1971
1972
1973	328	713	291	129	39	12	6			3	4
1974	238	178	283	147	53	20	8		2		1
1975	206	394	434	189	80	16	2	1	1	1
1976	182	635	480	224	77	48	19	3	1
1977	272	367	562	342	138	52	36	4	2
1978	404	391	210	263	182	53	7	10
1979	373	529	228	110	148	107	28	6	1		1
1980	117	330	358	134	69	71	56	16	8	3	1
1981	241	231	290	206	77	29	22	24	10
1982	368	372	138	103	88	24	13	7	5	5	2
1983	433	542	156	73	44	29	12	1	1	1
1984	300	427	176	51	17	8	2		1
1985	551	316	321	121	28	5	7	1	1
1986	515	566	158	156	37	5		2
1987	235	584	315	92	58	1	1	1
1988	162	279	367	102	12	3
1989	428	251	287	93	10	2					1
1990	301	384	227	115	22	1
1991	455	500	344	149	48	11	1
1992	711	628	362	113	7	1
1993	872	892	309	133	25
1994	441	1066	506	93	6	1
1995	717	817	400	122	7	1
1996	363	646	467	100	7	2
1997	447	579	409	79	7	1
1998	738	823	418	82	10	4
1999	657	1105	397	104	23	1	1
2000	526	1066	572	118	17	1	1
2001	511	1046	617	196	26	3
2002	470	953	523	103	10	4
2003	887	788	406	106	9	3
2004	689	846	270	101	6	1
2005	456	460	276	44	6	4
2006	837	296	147	73	3	2
2007	1145	525	149	47	16		1			1
2008	697	781	120	24	3	3	1
2009	470	553	392	60	9		3
Warm Regime - silver hake
2010	841	399	231	167	9
2011	686	591	202	141	29	3
2012	505	246	148	36	7	4
2013	651	806	346	171	38	4	1	1
2014	539	587	657	180	62	11	5	3
2015	308	678	464	507	57	29	4
2016	466	305	453	296	298	37	18	2
2017	253	545	88	276	150	103	3	3
2018	161	224	180	23	82	28	9	1
2019	538	729	334	282	33	72	22	16

white hake

	1	2	3	4	5	6	7	8	9	10	>10
White Hake - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - white hake
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982	14	71	131	40	36	8	2	3		2	3
1983	29	111	159	85	20	15	2	1		2	1
1984	16	54	103	78	33	14	6	1			3
1985	72	86	151	85	26	4	2	2
1986	24	249	263	76	45	16	1	1	2	1
1987	12	79	191	55	11	8	3	1	1		2
1988	23	147	107	92	28	7	1	2		1	2
1989	34	130	169	45	25	23	3	1
1990	63	210	189	116	25	6	3	3		2
1991	71	302	286	134	50	11	1			1	1
1992	28	173	383	218	22	10	5	3		1
1993	40	206	313	219	44	7
1994	51	229	243	103	27	14	3	2
1995	44	233	260	83	32	14	9	4		1	1
1996	44	78	142	102	43	8	4	4	4	1
1997	66	100	111	55	14	4	1	1		2
1998	49	187	138	48	15	6	3	2
1999	84	115	167	78	34	12	4	1
2000	40	233	215	79	38	10	3	3	1		1
2001	19	79	205	163	57	20	7	3	1	1	1
2002	57	74	81	110	38	12	7	3			2
2003	31	32	32	38	34	20	9	2	1		1
2004	50	62	66	33	16	6		1	2
2005	63	51	72	61	39	15	18	16	3	3	5
2006	111	80	72	32	21	13	6	11		1	1
2007	64	105	160	67	18	6	4	6	9	2	3
2008	103	139	162	87	12	7	6	2	5	1
2009	247	319	251	189	90	33	11	4		2	5
Warm Regime - white hake
2010	222	394	305	161	79	31	6	6	2		7
2011	147	293	281	170	81	46	16	4	2		2
2012	79	222	235	178	91	46	26	9	4	3
2013	55	171	164	90	25	12	9	3	1	2
2014	39	119	132	114	74	53	22	11	5		2
2015	154	199	192	157	99	27	11	5	3	3
2016	110	273	306	192	105	32	8	3	1	1
2017	71	102	145	145	139	55	20	5
2018	70	145	87	66	49	23	16	2	2	1	1
2019	165	225	220	179	93	48	25	10	5		2

winter flounder

	1	2	3	4	5	6	7	8	9	10	>10
Winter Flounder - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - winter flounder
1970
1971
1972
1973
1974
1975
1976	18	55	76	32	25	12	13	6	2		1
1977	1	28	58	27	16	5	1	5	2	2	1
1978
1979
1980	6	106	115	44	30	15		3	1		2
1981	39	79	145	70	22	16	15	6	2	2
1982	43	93	75	44	16	11	3	4			2
1983	17	60	112	67	45	26	18	10	4	1	2
1984	11	45	80	68	29	15	12	11	1	2	4
1985	11	56	73	48	27	15	12	2			1
1986	31	62	84	32	16	12	3	2	1	1	2
1987	7	90	78	41	14	6	5	2	1
1988	24	41	107	68	21	9	3	2	1
1989	7	65	48	40	25	5	4	1
1990	12	56	96	37	19	11	1	2	3	2
1991	11	70	99	49	24	4	3		1
1992	15	110	90	53	25	10	4		1
1993	38	58	64	36	11	5	6	1	1
1994	43	151	102	51	25	13			1
1995	49	120	131	53	22	9	6	1
1996	29	111	114	91	32	18	9	2	1
1997	38	111	146	79	38	10	6	1	1
1998	57	131	175	112	37	6	2
1999	67	154	139	102	67	23	7	3
2000	49	138	180	93	86	46	12	5	5
2001	36	86	129	122	58	42	28	6	2
2002	26	140	128	139	90	45	40	13	8	1
2003	27	51	99	87	61	41	20	6
2004	63	70	61	74	38	32	20	4	2
2005	27	102	82	84	62	51	13	5	1	1	1
2006	41	97	111	82	71	17	5	1
2007	46	78	83	70	66	31	9	3	1
2008	75	144	117	75	61	32	4	2	4	1	3
2009	95	260	225	146	87	59	16	9	4	3	8
Warm Regime - winter flounder
2010	83	182	243	153	101	65	28	8	6	1	8
2011	86	113	210	149	99	41	28	8	4	1	4
2012	95	197	187	174	127	58	24	13	6	3	8
2013	81	145	146	98	69	73	24	15	10	3	7
2014	82	95	151	116	59	48	51	38	8	5	8
2015	13	119	111	66	62	30	30	32	10	5	9
2016	124	136	146	59	77	52	22	19	20	10	10
2017	51	98	62	72	50	38	19	9	12	7	8
2018	68	71	78	41	38	17	25	9	9	6	11
2019	37	89	70	59	25	20	19	18	12	4	10

witch flounder

	1	2	3	4	5	6	7	8	9	10	>10
Witch Flounder - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - witch flounder
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982			5	17	17	17	23	20	8	8	22
1983	1		18	34	37	27	19	15	11	4	29
1984			4	34	41	34	29	16	10	7	33
1985			6	24	40	37	35	25	10	10	36
1986	3	6	8	13	31	40	36	14	12	2	30
1987			1	5	13	11	22	11	1	3	9
1988	1	1	26	6	5	11	30	14	7	5	9
1989	2	5	9	44	12	7	5	21	6	1	8
1990	5	11	22	25	19	3	5	4	5	2	10
1991	2	11	52	26	23	17	9	11	10	12	8
1992	3	7	29	41	12	12	17	5	12	3	13
1993	46	16	26	62	41	17	20	16	3	7	15
1994	21	39	42	34	55	15	14	3	8	2	8
1995	15	42	86	59	43	39	11	10	3	6	6
1996	6	18	41	78	75	37	10	5	2		5
1997	18	31	31	68	77	41	28	5		1	2
1998	24	88	83	57	78	72	31	18	7	1	3
1999	34	69	85	88	71	39	38	11	4	2
2000	5	34	84	87	56	48	29	17	5	4	1
2001	9	22	56	137	123	74	55	27	16	10	1
2002		20	54	130	119	67	67	39	18	10	11
2003		2	25	71	114	112	81	37	31	12	17
2004	4	4	7	43	76	74	76	50	15	18	24
2005	24	15	9	18	38	51	52	27	20	12	9
2006	11	50	44	25	28	72	67	44	22	9	8
2007	3	28	74	42	35	35	62	18	15		6
2008	4	29	50	102	54	40	42	40	11	8	2
2009	84	69	132	156	192	112	113	96	52	26	10
Warm Regime - witch flounder
2010	74	120	75	102	162	183	74	67	60	25	20
2011	39	112	159	80	92	120	61	37	24	29	20
2012	64	100	175	134	118	164	114	70	40	18	8
2013	56	84	63	122	84	60	72	48	27	10	3
2014	162	131	193	110	181	103	88	88	37	11	8
2015	39	176	213	161	128	186	87	77	35	9	5
2016	51	52	286	137	185	91	117	41	23	12	13
2017	44	82	72	293	88	121	49	83	23	17	28
2018	42	47	64	53	181	58	95	32	29	16	15
2019	102	110	106	93	83	205	84	77	23	23	26

yellowtail flounder

	1	2	3	4	5	6	7	8	9	10	>10
Yellowtail Flounder - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
Early Regime - yellowtail flounder
1970	98	239	365	262	87	29	11	2	3	2
1971	110	360	321	340	83	27	8	2	1	2
1972	82	300	282	175	130	46	10	2	1
1973	83	223	338	158	97	89	12	5	4		1
1974	102	182	134	132	62	32	25	5	2
1975	75	180	39	31	36	11	4	2			1
1976	47	272	85	30	21	18	10	6	3
1977	84	198	175	40	12	12	5	4		2
1978	167	313	141	75	18	3	8	6	2
1979	179	375	165	63	24	10	6	2		1
1980	85	394	337	179	33	12	4	1	2		1
1981	89	236	155	82	26	7	1	1
1982	43	279	185	73	34	9	4	1			1
1983	16	201	273	49	12	4	4	3	1
1984	32	51	65	84	25	10		3
1985	54	100	37	24	28	4	1
1986	23	185	61	20	8	4
1987	24	35	72	19	11	5	5	2			1
1988	71	55	28	26	21	4	1
1989	21	234	77	25	8	2	1
1990	2	48	257	51	9	2	1
1991	60	35	146	166	39	5
1992	28	95	116	101	18	5
1993	55	53	67	64	3		1
1994	92	105	85	63	37	9	1
1995	20	99	116	74	23	6	4	2	1
1996	21	68	160	107	32	2
1997	61	104	191	116	47	7
1998	73	242	144	78	38	15	2
1999	96	206	247	78	59	13	7	1	1
2000	24	140	159	54	19	17	3
2001	61	111	195	75	30	16	15
2002	54	165	176	90	30	6	10	4
2003	53	131	115	63	24	8	6	4	1
2004	27	98	109	49	18	4	2	1
2005	71	92	141	63	20	2	3	1
2006	158	253	170	87	19	5	2	2
2007	62	376	291	121	31	9	3
2008	33	124	256	81	17	2	1
2009	119	186	277	185	58	8	3
Warm Regime - yellowtail flounder
2010	65	252	331	200	115	18	5	2
2011	86	172	261	206	61	27	3	1
2012	76	240	228	189	78	25	14	1
2013	103	152	214	144	74	17	6	1
2014	65	168	137	118	38	20	3	4	2
2015	15	120	167	74	53	6	1	1
2016	93	105	147	85	32	23	6	4	2
2017	42	66	74	51	33	18	16	3
2018	46	62	58	39	20	7	3	6	2
2019	137	108	56	47	24	27	15	8	4

Size at Age Comparisons

Given that we can’t really construct meaningful VB curves for cohorts with a 10-year window of interest, we need to consider an alternative way of putting some statistics behind our numbers to assess significance.

I think looking at differences in LaA and WaA over periods of interest will be helpful. I think a useful example to emulate is Fig 3 and Table 1 in the attached Neuheimer and Gronkjaer paper. However, instead of using trend lines and slopes, it would be better to do a Welch’s t-test comparing 1970-2009 to 2010-2019 (and plotting means for those periods in the figure).

I’m also still debating whether to use 1970-2009 as the comparison or whether to do just the preceding decade, so seeing Welch’s t-test results for 2000-2009 and 2010-2019 would be helpful too.

Please truncate output values to no more than 3 decimal places so it’s easier to look at. (We’ll want to pull other stats out of the Welch’s t-test for the paper, but for shaping the paper, I’d prefer to see less right now.)

These are the methods to use for the tests and for testing assumptions:

Welch’s Two-Sample T-Test

Bartletts Two-Sample Test

Length at Age

The following tables display the results of two-sample testing comparing the length at age of each species between data from two different periods. Significant differences are highlighted when they occur, and in those rows the larger size period’s mean has been highlighted in green, with the smaller sized period’s mean highlighted in red.

1970-2009 & 2010-2019

american plaice

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
American Plaice Length at Age - Two-Sample Test
Comparison of 1980-2009 & 2010-2019 Data
american plaice
1	length_cm	1980	44.63	115.4	13.21	13.62	0.00	0.00
2	length_cm	1980	111.80	211.0	19.46	20.38	0.00	0.00
3	length_cm	1980	162.63	247.5	25.49	25.74	0.04	0.00
4	length_cm	1980	181.73	228.2	30.16	30.25	0.47	0.00
5	length_cm	1980	134.50	170.5	34.53	32.82	0.00	0.00
6	length_cm	1980	72.53	130.6	38.24	35.21	0.00	0.83
7	length_cm	1980	34.73	78.9	41.31	36.53	0.00	0.19
8	length_cm	1980	16.30	53.8	44.50	39.07	0.00	0.85
9	length_cm	1980	8.73	32.9	47.15	39.77	0.00	0.03

atlantic cod

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Atlantic Cod Length at Age - Two-Sample Test
Comparison of 1970-2009 & 2010-2019 Data
atlantic cod
1	length_cm	1970	75.58	75.1	29.09	28.14	0	0.14
2	length_cm	1970	135.22	145.6	43.17	41.53	0	0.00
3	length_cm	1970	129.28	151.3	55.90	52.56	0	0.00
4	length_cm	1970	100.22	126.3	65.19	60.73	0	0.00
5	length_cm	1970	54.95	60.1	73.23	68.73	0	0.00
6	length_cm	1970	29.73	22.0	80.61	74.96	0	0.09
7	length_cm	1970	14.57	7.1	88.84	81.25	0	0.05

atlantic herring

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Atlantic Herring Length at Age - Two-Sample Test
Comparison of 1987-2009 & 2010-2019 Data
atlantic herring
1	length_cm	1987	17.55	26.9	11.59	12.54	0	0.96
2	length_cm	1987	124.96	170.8	16.53	16.13	0	0.00
3	length_cm	1987	162.35	266.2	21.33	20.53	0	0.60
4	length_cm	1987	127.52	196.8	24.10	23.05	0	0.00
5	length_cm	1987	100.13	161.7	25.78	25.07	0	0.00
6	length_cm	1987	74.74	115.4	26.95	26.28	0	0.00
7	length_cm	1987	56.18	69.7	27.71	27.05	0	0.01
8	length_cm	1987	30.30	32.9	28.52	27.69	0	0.00

atlantic mackerel

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Atlantic Mackerel Length at Age - Two-Sample Test
Comparison of 1973-2009 & 2010-2019 Data
atlantic mackerel
1	length_cm	1973	62.89	163.20	21.52	21.88	0.00	0.00
2	length_cm	1973	57.42	154.40	27.10	27.04	0.42	0.00
3	length_cm	1973	26.50	77.20	30.92	30.27	0.00	0.00
4	length_cm	1973	13.64	29.40	33.36	31.98	0.00	0.00
5	length_cm	1973	9.17	6.11	35.00	34.42	0.02	0.93

black sea bass

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Black Sea Bass Length at Age - Two-Sample Test
Comparison of 1983-2009 & 2010-2019 Data
black sea bass
1	length_cm	1983	20.16	58.7	14.13	13.26	0.00	0.01
2	length_cm	1983	34.27	81.7	21.90	21.61	0.07	0.70
3	length_cm	1983	24.56	62.7	28.64	28.92	0.22	0.13
4	length_cm	1983	12.60	38.9	34.45	34.09	0.36	0.00
5	length_cm	1983	5.25	25.3	38.77	39.73	0.12	0.95

butterfish

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Butterfish Length at Age - Two-Sample Test
Comparison of 1982-2009 & 2010-2019 Data
butterfish
1	length_cm	1982	201.71	402.1	13.30	13.12	0.00	0.00
2	length_cm	1982	84.39	160.9	16.07	16.20	0.02	0.49
3	length_cm	1982	22.25	65.1	17.92	17.68	0.01	0.94
4	length_cm	1982	4.00	11.1	18.93	18.58	0.09	0.94

haddock

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Haddock Length at Age - Two-Sample Test
Comparison of 1970-2009 & 2010-2019 Data
haddock
1	length_cm	1970	105.26	421.80	26.88	23.44	0	0
2	length_cm	1970	116.53	369.70	37.38	31.96	0	0
3	length_cm	1970	116.42	357.60	45.81	37.88	0	0
4	length_cm	1970	93.95	290.20	50.71	41.72	0	0
5	length_cm	1970	64.26	239.40	54.58	45.23	0	0
6	length_cm	1970	49.50	209.20	56.90	47.04	0	0
7	length_cm	1970	22.42	119.70	60.33	52.20	0	0
8	length_cm	1970	16.64	67.22	62.16	52.95	0	0
9	length_cm	1970	10.06	29.33	63.21	53.86	0	0
10	length_cm	1970	7.79	19.50	67.32	55.95	0	0

pollock

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Pollock Length at Age - Two-Sample Test
Comparison of 1970-2009 & 2010-2019 Data
pollock
1	length_cm	1970	23.82	22.7	23.27	25.21	0.00	0.00
2	length_cm	1970	32.48	35.8	33.03	32.76	0.39	0.00
3	length_cm	1970	26.77	44.0	43.48	38.68	0.00	0.15
4	length_cm	1970	22.70	30.4	53.18	46.91	0.00	0.00
5	length_cm	1970	19.98	25.2	62.10	55.04	0.00	0.01
6	length_cm	1970	18.15	20.7	69.64	61.12	0.00	0.67
7	length_cm	1970	13.22	11.8	75.67	67.10	0.00	0.69
8	length_cm	1970	7.97	10.7	80.99	71.54	0.00	0.90

scup

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Scup Length at Age - Two-Sample Test
Comparison of 1971-2009 & 2010-2019 Data
scup
1	length_cm	1971	39.21	83.9	13.66	12.29	0	0.02
2	length_cm	1971	21.34	48.3	18.90	18.42	0	0.88
3	length_cm	1971	11.70	32.5	22.90	22.36	0	0.20
4	length_cm	1971	5.60	25.6	25.96	25.28	0	0.00

silver hake

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Silver Hake Length at Age - Two-Sample Test
Comparison of 1973-2009 & 2010-2019 Data
silver hake
1	length_cm	1973	479.54	494.8	19.21	20.67	0	0.63
2	length_cm	1973	590.78	511.0	25.57	28.47	0	0.00
3	length_cm	1973	334.19	310.3	31.01	34.18	0	0.00
4	length_cm	1973	121.54	207.9	35.91	38.74	0	0.00
5	length_cm	1973	38.49	76.5	39.88	43.91	0	0.00

white hake

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
White Hake Length at Age - Two-Sample Test
Comparison of 1982-2009 & 2010-2019 Data
white hake
1	length_cm	1982	55.32	111.2	27.16	28.98	0	0.00
2	length_cm	1982	140.50	214.3	35.74	37.44	0	0.00
3	length_cm	1982	172.21	206.7	45.85	45.03	0	0.00
4	length_cm	1982	91.82	145.2	57.69	53.19	0	0.00
5	length_cm	1982	31.89	83.5	67.54	60.76	0	0.00
6	length_cm	1982	11.75	37.3	75.62	68.39	0	0.01
7	length_cm	1982	4.77	15.9	81.64	75.06	0	0.74

winter flounder

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Winter Flounder Length at Age - Two-Sample Test
Comparison of 1976-2009 & 2010-2019 Data
winter flounder
1	length_cm	1976	33.09	72.0	20.50	19.01	0	0.00
2	length_cm	1976	94.31	124.5	27.24	26.28	0	0.00
3	length_cm	1976	106.94	140.4	32.63	30.77	0	0.00
4	length_cm	1976	69.25	98.7	36.65	34.95	0	0.28
5	length_cm	1976	39.56	70.7	39.93	37.74	0	0.06
6	length_cm	1976	20.38	44.2	42.82	39.86	0	0.19
7	length_cm	1976	10.00	27.0	46.19	40.94	0	0.31
8	length_cm	1976	4.21	16.9	49.86	42.81	0	0.35

witch flounder

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Witch Flounder Length at Age - Two-Sample Test
Comparison of 1982-2009 & 2010-2019 Data
witch flounder
1	length_cm	1982	14.77	67.3	13.56	14.44	0.00	0.15
2	length_cm	1982	26.83	101.4	20.00	22.05	0.00	0.00
3	length_cm	1982	39.61	140.6	24.57	26.88	0.00	0.86
4	length_cm	1982	54.50	128.5	29.47	30.60	0.00	0.00
5	length_cm	1982	54.46	130.2	33.18	33.10	0.53	0.00
6	length_cm	1982	41.46	129.1	36.17	35.16	0.00	0.00
7	length_cm	1982	36.64	84.1	39.28	37.22	0.00	0.32
8	length_cm	1982	22.11	62.0	41.82	39.46	0.00	0.59

yellowtail flounder

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Yellowtail Flounder Length at Age - Two-Sample Test
Comparison of 1970-2009 & 2010-2019 Data
yellowtail flounder
1	length_cm	1970	66.38	72.8	20.90	20.02	0.00	0.00
2	length_cm	1970	178.57	144.5	29.11	28.82	0.01	0.01
3	length_cm	1970	168.82	167.3	34.02	33.46	0.00	0.00
4	length_cm	1970	91.33	115.3	36.86	36.41	0.00	0.00
5	length_cm	1970	33.67	52.8	39.60	39.34	0.18	0.00
6	length_cm	1970	12.28	18.8	41.30	41.36	0.86	0.00

Weight at Age

The following tables display the results of two-sample testing comparing the weight at age of each species between data from two different periods. Significant differences are highlighted when they occur, and in those rows the larger size period’s mean has been highlighted in green, with the smaller sized period’s mean highlighted in red.

1970-2009 & 2010-2019

american plaice

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
American Plaice Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
american plaice
1	indwt	1992	59.44	110.2	0.02	0.02	0	0.00
2	indwt	1992	139.44	210.7	0.05	0.07	0	0.00
3	indwt	1992	191.67	247.5	0.13	0.15	0	0.00
4	indwt	1992	220.56	228.2	0.22	0.25	0	0.00
5	indwt	1992	166.67	170.5	0.35	0.32	0	0.42
6	indwt	1992	87.33	130.6	0.49	0.40	0	0.00
7	indwt	1992	38.94	78.8	0.61	0.46	0	0.00
8	indwt	1992	16.78	53.8	0.76	0.58	0	0.00
9	indwt	1992	8.33	32.9	0.91	0.62	0	0.00

atlantic cod

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Atlantic Cod Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
atlantic cod
1	indwt	1992	65.33	74.9	0.24	0.26	0.03	0.21
2	indwt	1992	118.00	145.5	0.83	0.77	0.00	0.00
3	indwt	1992	122.11	151.2	1.73	1.55	0.00	0.00
4	indwt	1992	103.06	126.3	2.70	2.36	0.00	0.00
5	indwt	1992	60.61	60.0	3.76	3.44	0.00	0.00
6	indwt	1992	29.28	22.0	4.94	4.46	0.01	0.00
7	indwt	1992	13.17	7.1	6.65	5.46	0.00	0.01

atlantic herring

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Atlantic Herring Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
atlantic herring
1	indwt	1992	19.41	26.9	0.01	0.10	0.14	0.00
2	indwt	1992	144.78	170.6	0.04	0.04	0.00	0.00
3	indwt	1992	193.11	266.0	0.08	0.08	0.00	0.01
4	indwt	1992	146.22	196.8	0.12	0.11	0.00	0.00
5	indwt	1992	119.22	161.6	0.15	0.14	0.00	0.00
6	indwt	1992	92.17	115.4	0.17	0.16	0.00	0.00
7	indwt	1992	68.11	69.6	0.19	0.17	0.00	0.00
8	indwt	1992	33.39	32.9	0.20	0.18	0.00	0.00

atlantic mackerel

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Atlantic Mackerel Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
atlantic mackerel
1	indwt	1992	110.78	163.10	0.09	0.10	0.00	0.00
2	indwt	1992	94.56	154.40	0.17	0.18	0.00	0.00
3	indwt	1992	39.89	77.20	0.27	0.26	0.18	0.00
4	indwt	1992	19.33	29.40	0.35	0.32	0.00	0.00
5	indwt	1992	9.44	6.11	0.43	0.40	0.02	0.72

black sea bass

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Black Sea Bass Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
black sea bass
1	indwt	1992	24.12	58.7	0.06	0.04	0.00	0.00
2	indwt	1992	33.59	81.6	0.16	0.15	0.00	0.61
3	indwt	1992	24.00	62.7	0.34	0.34	0.51	0.42
4	indwt	1992	15.69	38.9	0.60	0.53	0.00	0.00
5	indwt	1992	6.92	25.3	0.81	0.84	0.51	0.08

butterfish

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Butterfish Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
butterfish
1	indwt	1992	243.11	401.9	0.05	0.05	0.58	0.27
2	indwt	1992	94.78	160.9	0.08	0.09	0.00	0.00
3	indwt	1992	24.06	65.1	0.11	0.11	0.31	0.02
4	indwt	1992	5.25	11.1	0.13	0.13	0.52	0.59

haddock

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Haddock Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
haddock
1	indwt	1992	147.44	421.60	0.19	0.14	0	0
2	indwt	1992	160.44	369.70	0.49	0.35	0	0
3	indwt	1992	154.56	357.60	0.85	0.57	0	0
4	indwt	1992	132.67	290.20	1.15	0.75	0	0
5	indwt	1992	100.00	239.40	1.49	0.95	0	0
6	indwt	1992	78.39	209.20	1.67	1.06	0	0
7	indwt	1992	29.11	119.70	1.99	1.38	0	0
8	indwt	1992	18.72	67.22	2.10	1.45	0	0
9	indwt	1992	10.76	29.33	2.30	1.52	0	0
10	indwt	1992	5.13	19.50	2.52	1.76	0	0

pollock

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Pollock Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
pollock
1	indwt	1992	30.06	22.6	0.14	0.18	0.00	0.68
2	indwt	1992	41.22	35.8	0.38	0.40	0.12	0.46
3	indwt	1992	31.39	44.0	0.82	0.67	0.00	0.20
4	indwt	1992	27.83	30.4	1.46	1.13	0.00	0.00
5	indwt	1992	25.78	25.2	2.31	1.78	0.00	0.00
6	indwt	1992	22.67	20.7	3.34	2.41	0.00	0.02
7	indwt	1992	16.83	11.8	4.36	3.12	0.00	0.00
8	indwt	1992	6.00	10.7	4.99	3.83	0.00	0.01

scup

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Scup Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
scup
1	indwt	1992	42.89	83.9	0.06	0.04	0.00	0.00
2	indwt	1992	20.17	48.3	0.15	0.14	0.04	0.11
3	indwt	1992	10.11	32.5	0.27	0.25	0.00	0.46
4	indwt	1992	4.80	25.6	0.43	0.37	0.00	0.57

silver hake

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Silver Hake Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
silver hake
1	indwt	1992	637.44	482.3	0.05	0.07	0.00	0.00
2	indwt	1992	767.50	510.5	0.10	0.16	0.00	0.00
3	indwt	1992	371.44	310.1	0.19	0.31	0.00	0.00
4	indwt	1992	93.11	207.8	0.33	0.47	0.00	0.00
5	indwt	1992	10.72	76.5	0.65	0.72	0.02	0.91

white hake

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
White Hake Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
white hake
1	indwt	1992	66.17	111.1	0.16	0.20	0.00	0.00
2	indwt	1992	138.33	214.1	0.37	0.43	0.00	0.00
3	indwt	1992	170.28	206.6	0.82	0.79	0.01	0.00
4	indwt	1992	97.61	145.1	1.60	1.31	0.00	0.00
5	indwt	1992	33.00	83.4	2.52	1.93	0.00	0.51
6	indwt	1992	12.06	37.3	3.64	2.83	0.00	0.33
7	indwt	1992	6.25	15.9	4.91	3.81	0.00	0.01

winter flounder

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Winter Flounder Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
winter flounder
1	indwt	1992	45.22	70.0	0.12	0.11	0.01	0.00
2	indwt	1992	117.00	123.5	0.29	0.26	0.00	0.87
3	indwt	1992	120.33	140.4	0.48	0.39	0.00	0.00
4	indwt	1992	85.78	98.7	0.65	0.56	0.00	0.00
5	indwt	1992	52.00	70.7	0.85	0.71	0.00	0.00
6	indwt	1992	27.22	44.1	1.01	0.84	0.00	0.00
7	indwt	1992	12.18	27.0	1.31	0.91	0.00	0.00
8	indwt	1992	4.13	16.9	1.63	1.03	0.00	0.00

witch flounder

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Witch Flounder Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
witch flounder
1	indwt	1992	20.40	57.5	0.01	0.02	0.00	0.00
2	indwt	1992	32.33	100.9	0.04	0.06	0.00	0.00
3	indwt	1992	53.17	140.5	0.08	0.11	0.00	0.00
4	indwt	1992	71.89	128.5	0.15	0.17	0.00	0.00
5	indwt	1992	71.44	130.1	0.22	0.23	0.01	0.00
6	indwt	1992	53.11	129.1	0.28	0.27	0.03	0.00
7	indwt	1992	45.11	84.1	0.37	0.33	0.00	0.08
8	indwt	1992	26.00	61.9	0.44	0.41	0.00	0.52

yellowtail flounder

	Variable	Data Begins	N / year Early	N / year Late	Early Average	Late Average	p.value	bartlett_p
Yellowtail Flounder Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
yellowtail flounder
1	indwt	1992	61.39	72.7	0.10	0.09	0	0.00
2	indwt	1992	147.11	144.5	0.23	0.21	0	0.05
3	indwt	1992	166.44	167.2	0.36	0.31	0	0.00
4	indwt	1992	84.11	115.3	0.49	0.41	0	0.00
5	indwt	1992	29.06	52.8	0.68	0.53	0	0.00
6	indwt	1992	7.88	18.8	0.90	0.62	0	0.00

Condition Factor at Age

The following tables display the results of two-sample testing comparing fulton’s condition factor at age of each species between data from two different periods. Significant differences are highlighted when they occur, and in those rows the larger size period’s mean has been highlighted in green, with the smaller sized period’s mean highlighted in red.

1970-2009 & 2010-2019

Size at Maturity

Length and weight at first maturity for each species has been taken from NOAA fisheries and stock assessment report citations when no webpage was available. Values reported in the table below are either the higher value of a 1-year range given, or the middle value of 3-year ranges reported. References can be found in the decadal variability folder on Box.

Significant Growth Differences

With the exception of silver hake, all species in these tests are significantly smaller at older ages. There are instances where species are larger at their earliest ages (1-4 years of age), but their growth then plateaus and they ultimately reach a smaller adult size. Black sea bass is another possible exception, showing some age-classes with smaller lengths and weights, but not in a consistent pattern with increasing age.

1970-2009 vs. 2009-2019

	Size-at-Age Differences
	Length¹	Weight¹
American Plaice
Atlantic Cod
Atlantic Herring
Atlantic Mackerel
Black Sea Bass
Butterfish
Haddock
Pollock
Scup
Silver Hake
White Hake
Winter Flounder
Witch Flounder
Yellowtail Flounder
¹ Colored bars indicate the change in an ageclass characteristic moving from the periods of 1970-2009 to 2010-2019. Bars in orange indicate significant declines in length or weight. Bars colored in blue indicate significant increases in length or weight. And bars in gray indicate no difference in ageclass characteristics.

	Size-at-Age Differences
	Length¹	Weight¹
American Plaice
Atlantic Cod
Atlantic Herring
Atlantic Mackerel
Black Sea Bass
Butterfish
Haddock
Pollock
Scup
Silver Hake
White Hake
Winter Flounder
Witch Flounder
Yellowtail Flounder
¹ Colored arrows indicate significant changes in an ageclass characteristic moving from the period of 1970-2009 to individuals from 2010-2019. Downward facing arrows in yellow indicate significant declines in length or weight. Upward facing arrows colored in blue indicate significant increases in length or weight. And bars in gray indicate no difference in ageclass characteristics.

	Length at Age 1970-2009 to 2010-2019¹	Weight at Age 1992-2009 to 2010-2019¹
American Plaice
Atlantic Cod
Atlantic Herring
Atlantic Mackerel
Black Sea Bass
Butterfish
Haddock
Pollock
Scup
Silver Hake
White Hake
Winter Flounder
Witch Flounder
Yellowtail Flounder
¹ Colored bars indicate the magnitudes of significant changes in an ageclass characteristics moving from the period of 1970-2009 to individuals from 2010-2019. Bars filled in yellow indicate significant declines in length or weight. Bars colored in blue indicate significant increases in length or weight. And bars in gray indicate no significance in difference in ageclass characteristics.

Size at Age in Time

The following two sets of figures display what the average length or weight was each year for a given species. Means have been overlaid for the groups of years we are comparing above.

Length at Age

american plaice

atlantic cod

atlantic herring

atlantic mackerel

black sea bass

butterfish

haddock

pollock

scup

silver hake

white hake

winter flounder

witch flounder

yellowtail flounder

Weight at Age

american plaice

atlantic cod

atlantic herring

atlantic mackerel

black sea bass

butterfish

haddock

pollock

scup

silver hake

white hake

winter flounder

witch flounder

yellowtail flounder

Cohort Decadal Growth Differences

The following figures display what the average length or weight was for individuals born in a given decade. Means for each decade have been overlaid. No data for individuals born before 1970 were included here.